It may be worth the added expense to change out the whole panel to something bigger and better. If you plan to keep upgrading things in your house, then you will be thankful for the bigger panel down the road. If you do decide to change it out, it won't cost you that much more to buy all new breakers... most 15 and 20 AMP single pole breakers are only a few bucks each..
There seem to be alot of Andys here lately! Anyone seen Andy in ATL lately???